### Sphinx Doctest Setup and Code Example

Source: https://github.com/qgis/qgis-documentation/blob/master/README.md

Illustrates how to use Sphinx directives for testing Python code. 'testsetup' is for setup code not shown in docs, and 'testcode' is for the actual code to be tested.

```python
.. testsetup::

    from qgis.core import QgsCoordinateReferenceSystem

 .. testcode::

    # SRID 4326 is allocated for WGS84
    crs = QgsCoordinateReferenceSystem("EPSG:4326")
    assert crs.isValid()
```

--------------------------------

### Install pyogctest

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/developers_guide/ogcconformancetesting.rst

Sets up a virtual environment and installs the pyogctest tool.

```bash
virtualenv venv
source venv/bin/activate
pip install pyogctest
```

--------------------------------

### Install Apache and mod_fcgid

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Install the necessary Apache packages for hosting QGIS Server.

```bash
apt install apache2 libapache2-mod-fcgid
```

--------------------------------

### WFS GetCapabilities URL Example

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/services/wfs.rst

Example URL structure for a WFS GetCapabilities request.

```bash
http://localhost/qgisserver?
SERVICE=WFS
&VERSION=1.1.0
&...
```

--------------------------------

### Start QGIS Server with spawn-fcgi

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Manual command to start the QGIS Server process using spawn-fcgi.

```bash
spawn-fcgi -s /var/run/qgisserver.socket \
                -U www-data -G www-data -n \
                /usr/lib/cgi-bin/qgis_mapserv.fcgi
```

--------------------------------

### Complete metadata.txt Example

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/pyqgis_developer_cookbook/plugins/plugins.rst

A comprehensive example of a metadata.txt file containing both mandatory and optional fields.

```ini
; the next section is mandatory

[general]
name=HelloWorld
email=me@example.com
author=Just Me
qgisMinimumVersion=3.0
description=This is an example plugin for greeting the world.
    Multiline is allowed:
    lines starting with spaces belong to the same
    field, in this case to the "description" field.
    HTML formatting is not allowed.
about=This paragraph can contain a detailed description
    of the plugin. Multiline is allowed, HTML is not.
version=version 1.2
tracker=https://bugs.itopen.it
repository=https://www.itopen.it/repo
; end of mandatory metadata

; start of optional metadata
category=Raster
changelog=The changelog lists the plugin versions
    and their changes as in the example below:
    1.0 - First stable release
    0.9 - All features implemented
    0.8 - First testing release

; Tags are in comma separated value format, spaces are allowed within the
; tag name.
; Tags should be in English language. Please also check for existing tags and
; synonyms before creating a new one.
tags=wkt,raster,hello world

; these metadata can be empty, they will eventually become mandatory.
homepage=https://www.itopen.it
icon=icon.png

; experimental flag (applies to the single version)
experimental=True

; deprecated flag (applies to the whole plugin and not only to the uploaded version)
deprecated=False

; if empty, it will be automatically set to major version + .99
; qgisMaximumVersion=3.99

; Since QGIS 3.8, a comma separated list of plugins to be installed
; (or upgraded) can be specified.
; The example below will try to install (or upgrade) "MyOtherPlugin" version 1.12
; and any version of "YetAnotherPlugin".
; Both "MyOtherPlugin" and "YetAnotherPlugin" names come from their own metadata's
; name field
plugin_dependencies=MyOtherPlugin==1.12,YetAnotherPlugin
```

--------------------------------

### Install Requirements and Build Documentation

Source: https://github.com/qgis/qgis-documentation/blob/master/README.md

Installs project dependencies and triggers the HTML build process.

```sh
pip install -r REQUIREMENTS.txt
```

```sh
make html
```

--------------------------------

### Install Transifex CLI

Source: https://github.com/qgis/qgis-documentation/blob/master/README.md

Install the Transifex command-line client using a provided script. After installation, restart your terminal.

```sh
curl -o- https://raw.githubusercontent.com/transifex/cli/master/install.sh | bash
# and restart the terminal
```

--------------------------------

### Verify QGIS Server Installation

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Execute the FCGI binary to confirm the server is correctly installed.

```bash
/usr/lib/cgi-bin/qgis_mapserv.fcgi
```

--------------------------------

### Install NGINX

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Install the NGINX web server using the system's package manager.

```bash
apt install nginx
```

--------------------------------

### Install QtCreator on Debian

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/developers_guide/qtcreator.rst

Use the package manager to install QtCreator and its documentation on Debian-based systems.

```bash
sudo apt install qtcreator qtcreator-doc
```

--------------------------------

### Install QGIS Server packages

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/training_manual/qgis_server/install.rst

Use the apt package manager to install the QGIS Server and optional Python plugins.

```bash
apt install qgis-server --no-install-recommends --no-install-suggests

 # if you want to install server plugins, also:
 apt install python3-qgis
```

--------------------------------

### Enable, Start, and Check Xvfb Service Status

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Enables the Xvfb service to start on boot, starts it immediately, and checks its current status.

```bash
systemctl enable --now xvfb.service
systemctl status xvfb.service
```

--------------------------------

### WMS GetCapabilities Request Example

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/services/wms.rst

Example URL for a WMS GetCapabilities request. This request retrieves metadata about the WMS server.

```bash
http://localhost/qgisserver?
SERVICE=WMS
&VERSION=1.3.0
&REQUEST=GetCapabilities
```

--------------------------------

### Enable and Start QGIS Server Service

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Command to enable and start the systemd service for QGIS Server.

```bash
systemctl enable --now qgis-server
```

--------------------------------

### Enable and Start QGIS Server Service Instances

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Enables and starts multiple QGIS Server service instances (1 through 4).

```bash
for i in 1 2 3 4; do systemctl enable --now qgis-server@$i.service; done
```

--------------------------------

### Install Dependencies for English PDF Builds

Source: https://github.com/qgis/qgis-documentation/blob/master/README.md

Install the XeLaTex compiler and GNU Freefont, which are required for building English PDF documentation.

```shell
sudo apt install texlive-xetex fonts-freefont-otf
```

--------------------------------

### Install HelloWorld plugin manually

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/plugins.rst

Commands to create a plugin directory and download the HelloWorld demonstration plugin.

```bash
mkdir -p /var/www/qgis-server/plugins
cd /var/www/qgis-server/plugins
wget https://github.com/elpaso/qgis-helloserver/archive/master.zip
unzip master.zip
mv qgis-helloserver-master HelloServer
```

--------------------------------

### Get Y Coordinate of Geometry Vertex

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/user_manual/expressions/expression_help/GeometryGroup.rst

Retrieves the y-coordinate of a specific vertex within a geometry. Vertex indices start at 0.

```QGIS Expression
y_at( geom_from_wkt( 'POINT(4 5)' ), 0 )
```

--------------------------------

### Download and Prepare Sample Data

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Commands to create a project directory and download the QGIS training dataset.

```bash
mkdir /home/qgis/projects/
cd /home/qgis/projects/
wget https://github.com/qgis/QGIS-Training-Data/archive/release_3.22.zip
unzip release_3.22.zip
mv QGIS-Training-Data-release_3.22/exercise_data/qgis-server-tutorial-data/world.qgs .
mv QGIS-Training-Data-release_3.22/exercise_data/qgis-server-tutorial-data/naturalearth.sqlite .
```

--------------------------------

### Get X Coordinate of Geometry Vertex

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/user_manual/expressions/expression_help/GeometryGroup.rst

Retrieves the x-coordinate of a specific vertex within a geometry. Vertex indices start at 0.

```QGIS Expression
x_at( geom_from_wkt( 'POINT(4 5)' ), 0 )
```

--------------------------------

### Get Z-coordinate at Specific Vertex

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/user_manual/expressions/expression_help/GeometryGroup.rst

Retrieves the z-coordinate of a specified vertex within a geometry. The vertex index starts at 0 and can be negative to count from the end.

```sql
z_at(geom_from_wkt('LineStringZ(0 0 0, 10 10 5, 10 10 0)'), 1)
```

--------------------------------

### Test Setup for All Groups

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/documentation_guidelines/cookbook_guidelines.rst

Use `.. testsetup:: *` to include setup code that will be applied to all testing groups, ensuring common imports or declarations are available across different tests.

```python
from qgis.core import QgsCoordinateReferenceSystem
```

--------------------------------

### Get M Coordinate by Vertex Index

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/user_manual/expressions/expression_help/GeometryGroup.rst

Retrieves the M coordinate of a specific vertex in a geometry. Indices start at 0, and negative indices count from the end.

```qgis
m_at(geom_from_wkt('LineStringZM(0 0 0 0, 10 10 0 5, 10 10 0 0)'), 1)
```

--------------------------------

### Extract a slice from an array

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/user_manual/expressions/expression_help/Arrays.rst

Use array_slice to get a portion of an array. Specify the start and end positions, which are inclusive. Negative indices count from the end of the array.

```QGIS Expression
array_slice(array(1,2,3,4,5),0,3)
```

```QGIS Expression
array_slice(array(1,2,3,4,5),0,-1)
```

```QGIS Expression
array_slice(array(1,2,3,4,5),-5,-1)
```

```QGIS Expression
array_slice(array(1,2,3,4,5),0,0)
```

```QGIS Expression
array_slice(array(1,2,3,4,5),-2,-1)
```

```QGIS Expression
array_slice(array(1,2,3,4,5),-1,-1)
```

```QGIS Expression
array_slice(array('Dufour','Valmiera','Chugiak','Brighton'),1,2)
```

```QGIS Expression
array_slice(array('Dufour','Valmiera','Chugiak','Brighton'),-2,-1)
```

--------------------------------

### Configuring QGIS Server with Environment Variables and spawn-fcgi

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/config.rst

Set environment variables like QGIS_OPTIONS_PATH and QGIS_SERVER_LOG_STDERR before starting QGIS Server with spawn-fcgi. This example demonstrates setting log level and other options.

```bash
export QGIS_OPTIONS_PATH=/home/user/.local/share/QGIS/QGIS4/profiles/default/
export QGIS_SERVER_LOG_STDERR=1
export QGIS_SERVER_LOG_LEVEL=2
spawn-fcgi -f /usr/lib/cgi-bin/qgis_mapserv.fcgi -s /tmp/qgisserver.sock -U www-data -G www-data -n
```

--------------------------------

### Test HelloWorld plugin

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/plugins.rst

Verify the server installation by sending a request to the HelloWorld service.

```bash
wget -q -O - "http://localhost/cgi-bin/qgis_mapserv.fcgi?SERVICE=HELLO"
```

--------------------------------

### Get Y Coordinate of Geometry Vertex (Deprecated)

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/user_manual/expressions/expression_help/GeometryGroup.rst

Retrieves the y-coordinate of a vertex in the current feature's geometry. Vertex indices start at 0. This function is deprecated; use y_at() with @geometry instead.

```QGIS Expression
$y_at(1)
```

--------------------------------

### Enable Apache Modules and Site

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Enable the fcgid and rewrite Apache modules, and enable the QGIS Server virtual host site configuration.

```bash
a2enmod fcgid
a2enmod rewrite
a2ensite qgis.demo
```

--------------------------------

### Get X Coordinate of Vertex with $x_at (Deprecated)

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/user_manual/expressions/expression_help/GeometryGroup.rst

Retrieves the x-coordinate of a specific vertex in the current feature's geometry. Vertex indices start at 0. This function is deprecated; use x_at() with @geometry instead.

```sql
$x_at(1)
```

--------------------------------

### Define PostgreSQL Connection Parameters

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/training_manual/spatial_databases/simple_feature_model.rst

Example configuration values for setting up a new PostgreSQL connection in QGIS.

```text
Name: myPG
Service:
Host: localhost
Port: 5432
Database: address
User:
Password:
```

--------------------------------

### Set Target Properties for Installation

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/developers_guide/unittesting.rst

Configures installation properties for the test executable, including RPATH settings to ensure it can be found after installation. Handles platform-specific installation paths.

```bash
SET_TARGET_PROPERTIES(qgis_${testname}
PROPERTIES
# skip the full RPATH for the build tree
SKIP_BUILD_RPATHTRUE
# when building, use the install RPATH already
# (so it doesn't need to relink when installing)
BUILD_WITH_INSTALL_RPATH TRUE
# the RPATH to be used when installing
INSTALL_RPATH ${QGIS_LIB_DIR}
# add the automatically determined parts of the RPATH
# which point to directories outside the build tree to the install RPATH
INSTALL_RPATH_USE_LINK_PATH true)
IF (APPLE)
# For macOS, the executable must be at the root of the bundle's executable folder
INSTALL(TARGETS qgis_${testname} RUNTIME DESTINATION ${CMAKE_INSTALL_PREFIX})
ADD_TEST(qgis_${testname} ${CMAKE_INSTALL_PREFIX}/qgis_${testname})
ELSE (APPLE)
INSTALL(TARGETS qgis_${testname} RUNTIME DESTINATION ${CMAKE_INSTALL_PREFIX}/bin)
ADD_TEST(qgis_${testname} ${CMAKE_INSTALL_PREFIX}/bin/qgis_${testname})
ENDIF (APPLE)
```

--------------------------------

### Install fcgiwrap

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Command to install the fcgiwrap package.

```bash
apt install fcgiwrap
```

--------------------------------

### MicroK8s Setup Commands

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/containerized_deployment.rst

Commands to enable required MicroK8s features and push the QGIS Server image to the local registry.

```bash
microk8s enable dashboard dns registry
```

```bash
docker tag qgis-server 127.0.0.1:32000/qgis-server && docker push 127.0.0.1:32000/qgis-server
```

--------------------------------

### Install spawn-fcgi

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Command to install the spawn-fcgi package on Debian-based systems.

```bash
apt install spawn-fcgi
```

--------------------------------

### Set up Python Virtual Environment

Source: https://github.com/qgis/qgis-documentation/blob/master/README.md

Prepare the environment for managing dependencies by creating a virtual environment and activating it. This is a prerequisite for installing project requirements.

```sh
python3 -m venv venv
source ./venv/bin/activate
pip install -r REQUIREMENTS.txt
```

--------------------------------

### Buffer Algorithm Example

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/user_manual/processing/console.rst

Example of running the 'native:buffer' algorithm with all its parameters. Ensure parameter values match their expected types (e.g., integer for END_CAP_STYLE, boolean for DISSOLVE).

```python
>>> processing.run("native:buffer", {'INPUT': '/data/lines.shp',
                  'DISTANCE': 100.0,
                  'SEGMENTS': 10,
                  'DISSOLVE': True,
                  'END_CAP_STYLE': 0,
                  'JOIN_STYLE': 0,
                  'MITER_LIMIT': 10,
                  'OUTPUT': '/data/buffers.shp'})
```

--------------------------------

### Install Apache OSGeo4W Web Server Service

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Command to install the Apache web server as a Windows service using the OSGeo4W batch script. This is part of the QGIS Server installation on Windows.

```bash
> apache-install.bat
Installing the 'Apache OSGeo4W Web Server' service
The 'Apache OSGeo4W Web Server' service is successfully installed.
Testing httpd.conf....
Errors reported here must be corrected before the service can be started.
...
```

--------------------------------

### Implement serverClassFactory

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/pyqgis_developer_cookbook/server.rst

Entry point function required in __init__.py to load the plugin into QGIS Server.

```python
def serverClassFactory(serverIface):
    from MyAccessControl.AccessControl import AccessControlServer
    return AccessControlServer(serverIface)
```

--------------------------------

### Install GPSD on Ubuntu/Mint

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/user_manual/working_with_gps/live_GPS_tracking.rst

Install the GPSD daemon to facilitate GPS device communication.

```bash
sudo apt install gpsd
```

--------------------------------

### Server Plugin Structure Example

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/pyqgis_developer_cookbook/server.rst

Illustrates the basic structure of a QGIS server plugin, highlighting the availability of QgsServerInterface and methods for registering custom filters, services, or APIs.

```python
# Server python plugins are loaded once when the QGIS Server application starts
# and can be used to register filters, services or APIs.

# The structure of a server plugin is very similar to their desktop counterpart,
a :class:`QgsServerInterface <qgis.server.QgsServerInterface>` object is made available to
# the plugins and the plugins can register one or more custom filters, services or APIs
# to the corresponding registry by using one of the methods exposed by the server interface.
```

--------------------------------

### QGIS Server Environment Variables Example

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Example configuration for QGIS Server environment variables, specifying project file, logging output, and log level.

```make
QGIS_PROJECT_FILE=/etc/qgis/myproject.qgs
QGIS_SERVER_LOG_STDERR=1
QGIS_SERVER_LOG_LEVEL=3
```

--------------------------------

### WMTS Service URL Example

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/user_manual/working_with_ogc/ogc_client_support.rst

Example URL for accessing a WMTS GetCapabilities request.

```text
# example of WMTS service

https://opencache.statkart.no/gatekeeper/gk/gk.open_wmts?service=WMTS&request=GetCapabilities
```

--------------------------------

### Show QgsAuthConfigSelect GUI

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/pyqgis_developer_cookbook/authentication.rst

Demonstrates the basic instantiation and display of the QgsAuthConfigSelect GUI. Ensure the parent widget is properly set up.

```python
parent = QWidget()  # Your GUI parent widget
gui = QgsAuthConfigSelect( parent )
gui.show()
```

--------------------------------

### Configure Eclipse startup batch file

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/pyqgis_developer_cookbook/plugins/ide_debugging.rst

Create a script to initialize the OSGeo4W environment and launch Eclipse with the necessary path variables.

```bat
call "C:\OSGeo4W\bin\o4w_env.bat"
set PATH=%PATH%;C:\path\to\your\qgis_core.dll\parent\folder
start /B C:\path\to\your\eclipse.exe
```

--------------------------------

### Delimited Text File with WKT Geometry Examples

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/user_manual/managing_data_source/supported_data.rst

This example demonstrates how to store geometry information in a delimited text file using Well-Known Text (WKT) format. It includes examples for LineString, CircularString, CurvePolygon, and CompoundCurve.

```text
Label;WKT_geom
LineString;LINESTRING(10.0 20.0, 11.0 21.0, 13.0 25.5)
CircularString;CIRCULARSTRING(268 415,227 505,227 406)
CurvePolygon;CURVEPOLYGON(CIRCULARSTRING(1 3, 3 5, 4 7, 7 3, 1 3))
CompoundCurve;COMPOUNDCURVE((5 3, 5 13), CIRCULARSTRING(5 13, 7 15,
  9 13), (9 13, 9 3), CIRCULARSTRING(9 3, 7 1, 5 3))
```

--------------------------------

### QGIS Server Output Examples

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/getting_started.rst

Expected output logs when running the QGIS server binary.

```text
QFSFileEngine::open: No file name specified
Warning 1: Unable to find driver ECW to unload from GDAL_SKIP environment variable.
Warning 1: Unable to find driver ECW to unload from GDAL_SKIP environment variable.
Warning 1: Unable to find driver JP2ECW to unload from GDAL_SKIP environment variable.
Warning 1: Unable to find driver ECW to unload from GDAL_SKIP environment variable.
Warning 1: Unable to find driver JP2ECW to unload from GDAL_SKIP environment variable.
Content-Length: 206
Content-Type: text/xml; charset=utf-8

<ServiceExceptionReport version="1.3.0" xmlns="https://www.opengis.net/ogc">
 <ServiceException code="Service configuration error">Service unknown or unsupported</ServiceException>
</ServiceExceptionReport>
```

```text
Application path not initialized
Application path not initialized
Warning 1: Unable to find driver ECW to unload from GDAL_SKIP environment variable.
Warning 1: Unable to find driver ECW to unload from GDAL_SKIP environment variable.
Warning 1: Unable to find driver JP2ECW to unload from GDAL_SKIP environment variable.
"Loading native module /usr/lib/qgis/server/libdummy.so"
"Loading native module /usr/lib/qgis/server/liblandingpage.so"
"Loading native module /usr/lib/qgis/server/libwcs.so"
"Loading native module /usr/lib/qgis/server/libwfs.so"
"Loading native module /usr/lib/qgis/server/libwfs3.so"
"Loading native module /usr/lib/qgis/server/libwms.so"
"Loading native module /usr/lib/qgis/server/libwmts.so"
QFSFileEngine::open: No file name specified
Content-Length: 102
Content-Type: application/json
Server:  QGIS FCGI server - QGIS version 3.22.6-Białowieża
Status:  400
[{"code":"Bad request error","description":"Requested URI does not match any registered API handler"}]
```

--------------------------------

### Initialize Authentication Manager and Master Password

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/pyqgis_developer_cookbook/authentication.rst

Demonstrates how to verify or set the master password for the authentication database.

```python
authMgr = QgsApplication.authManager()

# check if QgsAuthManager has already been initialized... a side effect
# of the QgsAuthManager.init() is that AuthDbPath is set.
# QgsAuthManager.init() is executed during QGIS application init and hence
# you do not normally need to call it directly.
if authMgr.authenticationDatabasePath():
    # already initialized => we are inside a QGIS app.
    if authMgr.masterPasswordIsSet():
        msg = 'Authentication master password not recognized'
        assert authMgr.masterPasswordSame("your master password"), msg
    else:
        msg = 'Master password could not be set'
        # The verify parameter checks if the hash of the password was
        # already saved in the authentication db
        assert authMgr.setMasterPassword("your master password",
                                          verify=True), msg
else:
```

--------------------------------

### Example Code Block

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/about/conventions.rst

Lines of code are indicated by a fixed-width font. This example shows a PROJCS definition.

```plaintext
PROJCS["NAD_1927_Albers",
  GEOGCS["GCS_North_American_1927",

```

--------------------------------

### QGIS Development Server Example Output

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/server_manual/development_server.rst

Example output from the QGIS Development Server showing connection logs and served requests. It indicates the listening address and port.

```bash
QGIS Development Server listening on http://localhost:8000
CTRL+C to exit
127.0.0.1 [lun gen 20 15:16:41 2020] 5140 103ms "GET /wfs3/?MAP=/tests/testdata/qgis_server/test_project.qgs HTTP/1.1" 200
127.0.0.1 [lun gen 20 15:16:41 2020] 3298 2ms "GET /wfs3/static/jsonFormatter.min.js HTTP/1.1" 200
127.0.0.1 [lun gen 20 15:16:41 2020] 1678 3ms "GET /wfs3/static/jsonFormatter.min.css HTTP/1.1" 200
127.0.0.1 [lun gen 20 15:16:41 2020] 1310 5ms "GET /wfs3/static/style.css HTTP/1.1" 200
127.0.0.1 [lun gen 20 15:16:43 2020] 4285 13ms "GET /wfs3/collections?MAP=/tests/testdata/qgis_server/test_project.qgs HTTP/1.1" 200
```

--------------------------------

### Verify QGIS Server installation

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/training_manual/qgis_server/install.rst

Check the version information of the QGIS Server executable to confirm successful installation.

```bash
/usr/lib/cgi-bin/qgis_mapserv.fcgi --version
```

--------------------------------

### Install pgAdmin III on Ubuntu

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/training_manual/database_concepts/data_model.rst

Installs the pgAdmin III GUI tool using the apt package manager.

```bash
sudo apt install pgadmin3
```

--------------------------------

### Execute QGIS from build directory

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/developers_guide/qtcreator.rst

Commands to navigate to the build directory and launch the QGIS executable.

```bash
cd $HOME/dev/cpp/QGIS/build-master-qtcreator
./output/bin/qgis
```

--------------------------------

### QGIS Test Definition Example

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/developers_guide/unittesting.rst

Example of how to define a QGIS test using the ADD_QGIS_TEST macro in a CMakeLists.txt file.

```cmake
# QgsRasterLayer test
ADD_QGIS_TEST(rasterlayertest testqgsrasterlayer.cpp)
```

--------------------------------

### Python Code Block Example

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/documentation_guidelines/cookbook_guidelines.rst

This is an example of a standard Python code block, typically used for syntax highlighting.

```python
crs = QgsCoordinateReferenceSystem("EPSG:4326")
assert crs.isValid()
```

--------------------------------

### Example .pg_service.conf Structure

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/user_manual/managing_data_source/opening_data.rst

Defines connection parameters for different PostgreSQL services. Save this content in a file named .pg_service.conf on Unix-like systems or pg_service.conf on Windows.

```ini
[water_service]
host=192.168.0.45
port=5433
dbname=gisdb
user=paul
password=paulspass

[wastewater_service]
host=dbserver.com
dbname=water
user=waterpass
```

--------------------------------

### QGIS Plugin .pro File Example

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/pyqgis_developer_cookbook/plugins/plugins.rst

A sample .pro file for a QGIS plugin, specifying UI forms, source files, and translation files for Qt Linguist.

```pro
FORMS = ../form.ui
SOURCES = ../your_plugin.py
TRANSLATIONS = your_plugin_it.ts
```

--------------------------------

### Install PostGIS on Ubuntu

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/training_manual/spatial_databases/spatial_functions.rst

Installs PostgreSQL and PostGIS using apt. The exact versions depend on your Ubuntu version and repositories.

```bash
$ sudo apt install postgresql
$ sudo apt install postgis
```

--------------------------------

### Run QGIS with a New User Profile

Source: https://github.com/qgis/qgis-documentation/blob/master/docs/user_manual/introduction/qgis_configuration.rst

Use this command to start QGIS with a specific, new user profile. This is useful for testing or isolating settings.

```bash
qgis-ltr --profile newprofilename
```